C Is For Corpse by Sue Grafton

In this mystery novel, private investigator Kinsey Millhone is hired by a young man named Bobby Callahan, who survived a car accident that left him with partial amnesia and killed his friend. Bobby believes the crash was an attempt on his life and enlists Kinsey's help to uncover the truth. As she delves into Bobby's past, Kinsey encounters a web of secrets, deceit, and danger, leading her to a chilling discovery that puts her own life at risk. The story unfolds with suspense and intrigue as Kinsey races against time to solve the case before the killer strikes again.